49
Servicing should only be performed by a Qualified Service Agent
temperatures
operating Set Point And Differential Adjustment
The Operating Set Point is adjustable from 90°f (42°C) to 180°f (82°C) for commercial and 160°f (71°C)
on residential models. The factory setting is 120°f (49°C). The Differential is adjustable from 2° to 20°.
The factory setting is 8°. When the water temperature sensed by the Control System from the Temperature
Probe reaches the Operating Set Point the Control System will end the heating cycle. A heating cycle will be
activated again when the water temperature drops below Operating Set Point minus the Differential setting.
note:
Set the Operating Set Point to the lowest setting which produces an acceptable hot water supply for
the most efficient use. Lower Differential settings may cause excessive heating cycles (short-cycling) which
can cause premature failure of components such as the Igniter. Set the Differential at the highest setting
which produces an acceptable hot water supply to prevent short cycling.
desCription/aCtion
display
from the Desktop Screen, press the Operational Button under
MENU. The "Main Menu" screen will be displayed.
Tank Temperature
120°F
Operating Set Point
120°F
Status: Standby
MENU
HELP
MANUFACTURER / MODEL INFORMATION
The Main Menu is where all Control System menus are listed,
see Table 7 on page 48 for a complete list and description of
Control System menus. Use the Up and Down Buttons to view
all Control System menus from the Main Menu.
With Temperatures menu selected (highlighted in black) in
the Main Menu screen, press the Operational Button under
“SELECT” to enter the Temperatures menu.
If the Temperatures menu is not selected use the Up and Down
Buttons to select this menu item.
Temperatures
Heater Status
Display Settings
Heater Information
Current Fault
SELECT
BACK
HELP
Main Menu
With the Operating Set Point selected in the Temperatures
menu, press the Operational Button underneath “CHANGE” to
activate the adjustment mode for this menu item.
If Operating Set Point is not selected use the Up and Down
Buttons to select this menu item.
note:
Higher Temperature settings increase wear and
operating costs. Set the Operating Set Point to the lowest
setting which produces an acceptable hot water supply. This
will always provide the most energy efficient operation and
longer life.
Operating Set Point
120°F
Differential
8°F
Tank Temperature
120°F
Tank Probe Offset 0°F
CHANGE
BACK
HELP
Temperatures
With the adjustment mode for the Operating Set Point activated
the selection bar will change from a black fill to a black outline.
Use the Up and Down Buttons to change the current setting.
Press the Operational Button under "UPDATE" to save the
new setting. Press the Operational Button under "CANCEL" to
discard changes and return to the previously saved setting.
note:
Use this same procedure to change the Differential
setting and other adjustable user settings in the Control System
menus.
Operating Set Point
140°F
Differential
8°F
Tank Temperature
120°F
Tank Probe Offset
0°F
UPDATE
CANCEL
Temperatures
